Berglar, Peter (1994), Opus Dei. Life and Work of its Founder, Princeton: Scepter Publishers, ISBN0-933932-65-0. A study of Opus Dei based on the life story and work of its founder written by a professor of history at the University of Cologne.

B. Badrinas, ed. (1992). Testimonies on Josemaría Escrivá, Founder of Opus Dei, Sinagtala. – collection of some testimonies given by ecclesiastical officials which were used for the beatification process.